knight



(No Model.) 7 2Sheets-Sheet 1'; W. H. H. & F. H. KNIGHT & A. M. PROGTOR.

PORTABLE OVEN.

atend June 23, 1885.

(No Model.) 2 Sheets-Sheet 2. W. H. H. & F. H. KNIGHT & A. M. PR'OOTOR.

PORTABLE OVEN.

No 320,801. Patented June 23, 1885.

U ITED STATES PATENT OFFICE.

WILLIAM H. H. KNIGHT, FRANK H. KNIGHT, AND ALEXANDER M. PROG- TOR, OF WASHINGTON, DISTRICT OF COLUMBIA.

PORTABLE OVEN.

SPECIFICATION forming part of Letters Patent No. 320,801, dated June 23,1885.

Application filed May 13, 1885.

To all whom it may concern.-

Be it known that we, WILLIAM H. H. KNIGHT, FRANK H. KNIGHT, and ALEXAN- DER M. PROCTOR, citizens of the United States, residing at Washington, District of Columbia, have invented certain new and useful Improvements in Portable Ovens; and we do declare the following to be a full, clear, and exact description of theinvention,such as will enable othersskilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to portable ovens adapted to serve with separate summer stoves or other combustion furnaces; and the novelty consists in the construction, arrangement, and adaptation of parts as will bemore fully hereinafter set forth, and specifically pointed out in the claims.

The essential object of this invention is to produce an oven which may be used efficiently with summer stoves or furnaces having a downward draft and an underneath exit for the products of combustion such, for instance, as isembodied in the applications of W. H. H. Knight, one of the present inventors, filed March 25, 1885, and April 17, 1885. Vveprovide an oven in which the productsof combustion from such a stove may be carried around the oven to heat the same for baking or roasting, and thence by a flue either to the ordinary flue 'of a kitchen, office, or parlor stove to the chimney. We provide seats for coffee-pots or prepared dishes upon the upper surface of the oven adjacent to the exit-flue therefrom, which provisions allow for the utilization of heat which otherwise would pass idly away. We provide means for adjusting the temperature ofthe oven at will by adamper, which may be set to force all the products of combustion around the oven to allow a portion thereof to pass directly to the escape-flue when a moderate heat only is required, or to direct all such products to the escape-flueas in cases when the oven is not in use. In the latter case the oven would not only form a convenient support for the stove, but the fea- (No model.)

with a downward-draft summer stove or other similar furnace. Fig. 3 is a vertical central section taken on the line or w of Fig. 1, showing the position of the damper and shield when draft is shut off from the oven-flue, and is open direct to the exit-flue. Fig. 4 is a similar View with the damper and shield in a position to direct the products of combustion around the oven. Fig. 5 is a view corresponding to Fig. 4, showing a modification in which the shield is rigid and all the products of combustion pass around the oven. Fig. 6 is a transverse section taken on the line 3/ y of Fig. 1.

Referring to the drawings, A designates the stove, which, as illustrated, is of the class described in the applications hereinbefore referred to; but it will be understood that any combustion furnace havinga downward draft and a bottom draft exit will serve the purposes of this invention.

B designates our improved oven. It is formed of sheet metal and has upon its upper in form, and its cap B may be removable, as

illustrated, or it may be rigid with the vertical sides 0 O and front 0 and back 0 Within the body of the oven 13 we form an oven-chamber, F, of such relative dimensions as to form between it and the front 0 a flue, D between it and the bottom 0 a horizontal flue, D, and between it and the back 0 an up-flue, D The oven proper is also formed of sheet metal and is supported within the shell B in any suitable manner which will provide the relative arrangement of flues suggested.

We illustratea bracket, G, which is secured to the side 0 opposite the door-aperture, and

which is bent to form lugs g, which engage the top and bottom plates of the oven, as seen at f and f. This plate or bracket G forms the back of the oven-chamber, and the space between it and the side (seen at serves as an efficient non-conducting dead-air chamber.

The door H is hinged to the side 0, and it has a similar chamber-,h, which will retain sufficient heated air to prevent sudden chilling of the interior in opening the door for quick inspection.

Between the top f of the oven-chamber and the cap B of the shell or structure is located the heat-receiving chamber M. The admitted heat is so intense at this point as to endanger the top of the oven, either from its liability to burn out the plate f or by reason of producing a scorching heat in contact with the edible being treated. We avoid this by employing ashield, I, which covers the plate f below the heatinlet b. This shield I will serve its functions of protecting the oven from the intensity of the heat if made stationary, as seen in Fig. 5; but we prefer to make the shield movable, and have it also serve as an efficient damper or deflector in the manipulation of which the operator may regulate or adjust the temperature of the oven-chamber at will. To this end we provide the shield I with an upturned flange, i, which will abut against a downwardly-projecting flange, K, supported from the top 13 to shut off the flow of products of combustion from the flue b in that direction, and to force it to pass through the dues D D D which comprise three sides of the oven-chamber. When the shield is thus disposed the flue D is open to its fullest extent,

as seen in Fig. 4. When, however, the shield I is withdrawn, as by means of a handle, L,an extension, 73, comes in contact with the side 0 toclose the flue D" and direct the gases to the exit I), as seen in Fig. 3. In either of these conditions the heated gases approach the back part of the cap B in mingled volumes, and will eddy and whirl around the contracted exit b before they pass away. o utilize the heat while the products are being thus retarded. We provide holes, as s 8, one upon either side of the exit I), over which may be placed a coffee-pot, a teapot, or vessels holding other edibles for the table. The holes 8 have covers s, and certain cooking may be accomplished by the use of these holes, the heat and gases being whirled and eddied under the vessel.

In the construction and in other minor details modifications may be made within wide limits. The proportions may be varied, and the means for securing and supporting the oven proper within the shell may be modified without departing from the principle or sacrificing the advantages of our invention, the essential feature of which is an oven having an interior oven-chamber, a heatreceiving inlet upon the top adapted to receive the products of combustion from a down-draft furnace, and having a controlled flue, which allows the said products to bathe three or more sides of the oven-chamber before they leave the structure.

What we claim as new is 1. The combination, with a portable oven havinga down-draftinlet and an interior ovenchamber, of a shield interposed between said downdraft inlet and the oven-chamber, substantially as described.

2. In a portable oven having a down-draft inlet and an interior oven, a movable shield having a damper-flange, and means, as L, for operating it, as set forth.

3. In a portable oven, as described,the combination, with the shell 13, having heat-reeeiving inlet b and draft-exit bin the top 13,01 the interior oven-chamber arranged to form fiues D D D", as shown, the damper-shield, and the covered holes 8 8, arranged adjacent to the exit, the whole adapted to serve with a summer stove, as A, as and for the purposes set forth.

In testimony whereof we affix our signatures in presence of two witnesses.

WVILLIAM H. H. KNIGHT. F. H. KNIGHT. A. M. PROOTOR.

Witnesses:

S. H. SIMo s, H. T. BERNI-IARD. 

